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Moderate exercise induces different autonomic modulations of sinus and AV node.
Pacing Clin Electrophysiol. 2005 Mar; 28(3):196-9.PC

Abstract

BACKGROUND

The routine determination of heart rate variability (HRV) from surface ECGs is based on RR intervals because of the difficulty to precisely locate the P-wave fiducial point on surface ECG recordings. The aim of the study was to assess the changes of RR, PP, and PR intervals at rest and during moderate exercise. The time intervals were determined from atrial and ventricular pacemaker-mediated intracardiac electrograms.

METHODS

Ten patients in sinus rhythm with intrinsic AV node conduction who had received the dual-chamber pacemaker Logos (Biotronik) were included. High-resolution atrial and ventricular intracardiac electrograms were transmitted at rest in supine position and during walking to a portable external recorder. Recording sequences of 150 successive heart cycles were used for HRV analyses after computer-assisted triggering of P and R events. The HRV-index SDNN and power spectral densities for the low (LF; 0.04-0.15 Hz) as well as high (HF; 0.15-0.40 Hz) frequency bands were determined.

RESULTS

SDNN decreased from 26.0 +/- 8.1 ms at rest to 18.3 +/- 4.2 ms during exercise for the PP intervals (P < 0.05) and from 26.8 +/- 8.1 to 18.4 +/- 4.1 ms for the RR intervals (P < 0.05). The LF/HF ratio increased from 2.02 +/- 1.3 to 4.5 +/- 1.5 in the atrium (P < 0.05) and from 2.0 +/- 1.2 to 5.2 +/- 1.9 in the ventricle P < 0.05). Comparing atrial and ventricular HRV at both activity levels, no significant differences were observed for the power of LF and HF spectral components. Regarding the PR intervals SDNN, the total power and the LF/HF ratio did not significantly change during exercise.

CONCLUSIONS

The described technique enabled to record intracardiac electrograms not only at rest, but also during moderate exercise and to use them for HRV evaluation. The changes of PP and RR, but not of the PR intervals, during exercise indicate that autonomic inputs to the sinus node and AV node are independent from each other. The ventricular HRV seems to derive mainly from variations of the sinus node pulse formation.

Authors+Show Affiliations

Schuchert A
Medical Clinic III, University Hospital Hamburg-Eppendorf, Hamburg, Germany. schuchert@uke.uni-hamburg.de
Wagner SM
No affiliation info available
Frost G
No affiliation info available
Meinertz T
No affiliation info available

MeSH

AgedAtrioventricular NodeAutonomic Nervous SystemElectrocardiographyExerciseFemaleHeart BlockHeart RateHumansMalePacemaker, ArtificialRestSick Sinus SyndromeSinoatrial NodeStatistics, NonparametricSupine PositionWalking

Pub Type(s)

Journal Article

Language

eng

PubMed ID

15733178

Citation

Schuchert, Andreas, et al. "Moderate Exercise Induces Different Autonomic Modulations of Sinus and AV Node." Pacing and Clinical Electrophysiology : PACE, vol. 28, no. 3, 2005, pp. 196-9.
Schuchert A, Wagner SM, Frost G, et al. Moderate exercise induces different autonomic modulations of sinus and AV node. Pacing Clin Electrophysiol. 2005;28(3):196-9.
Schuchert, A., Wagner, S. M., Frost, G., & Meinertz, T. (2005). Moderate exercise induces different autonomic modulations of sinus and AV node. Pacing and Clinical Electrophysiology : PACE, 28(3), 196-9.
Schuchert A, et al. Moderate Exercise Induces Different Autonomic Modulations of Sinus and AV Node. Pacing Clin Electrophysiol. 2005;28(3):196-9. PubMed PMID: 15733178.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Moderate exercise induces different autonomic modulations of sinus and AV node. AU - Schuchert,Andreas, AU - Wagner,Stefan M, AU - Frost,Gaby, AU - Meinertz,Thomas, PY - 2005/3/1/pubmed PY - 2005/7/1/medline PY - 2005/3/1/entrez SP - 196 EP - 9 JF - Pacing and clinical electrophysiology : PACE JO - Pacing Clin Electrophysiol VL - 28 IS - 3 N2 - BACKGROUND: The routine determination of heart rate variability (HRV) from surface ECGs is based on RR intervals because of the difficulty to precisely locate the P-wave fiducial point on surface ECG recordings. The aim of the study was to assess the changes of RR, PP, and PR intervals at rest and during moderate exercise. The time intervals were determined from atrial and ventricular pacemaker-mediated intracardiac electrograms. METHODS: Ten patients in sinus rhythm with intrinsic AV node conduction who had received the dual-chamber pacemaker Logos (Biotronik) were included. High-resolution atrial and ventricular intracardiac electrograms were transmitted at rest in supine position and during walking to a portable external recorder. Recording sequences of 150 successive heart cycles were used for HRV analyses after computer-assisted triggering of P and R events. The HRV-index SDNN and power spectral densities for the low (LF; 0.04-0.15 Hz) as well as high (HF; 0.15-0.40 Hz) frequency bands were determined. RESULTS: SDNN decreased from 26.0 +/- 8.1 ms at rest to 18.3 +/- 4.2 ms during exercise for the PP intervals (P < 0.05) and from 26.8 +/- 8.1 to 18.4 +/- 4.1 ms for the RR intervals (P < 0.05). The LF/HF ratio increased from 2.02 +/- 1.3 to 4.5 +/- 1.5 in the atrium (P < 0.05) and from 2.0 +/- 1.2 to 5.2 +/- 1.9 in the ventricle P < 0.05). Comparing atrial and ventricular HRV at both activity levels, no significant differences were observed for the power of LF and HF spectral components. Regarding the PR intervals SDNN, the total power and the LF/HF ratio did not significantly change during exercise. CONCLUSIONS: The described technique enabled to record intracardiac electrograms not only at rest, but also during moderate exercise and to use them for HRV evaluation. The changes of PP and RR, but not of the PR intervals, during exercise indicate that autonomic inputs to the sinus node and AV node are independent from each other. The ventricular HRV seems to derive mainly from variations of the sinus node pulse formation. SN - 0147-8389 UR - https://www.unboundmedicine.com/medline/citation/15733178/Moderate_exercise_induces_different_autonomic_modulations_of_sinus_and_AV_node_ DB - PRIME DP - Unbound Medicine ER -